Ben wrote:
I planted these Silk Lilacs in the spring. Since then I've decided
to raise them about 4" because of spring flooding. I intend to dig a
trench next year installing a bigO so the area will always be dry.
When is the best time to transplant (raise) these trees?



That URL is no good.

Why bother if you are only going to raise them 4 inches?

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Travis in Shoreline (just North of Seattle) Washington
USDA Zone 8
Sunset Zone 5